Ferroelectric materials have attracted the attention of researchers because of their application in photovoltaics. Spontaneous polarization caused by symmetry breaking in ferroelectrics is conducive to the separation of photogenerated carriers, resulting in excellent photoconductivity and photovoltaic performance. The study of the interaction between light and matter in ferroelectric materials (two-photon optical absorption) is of great significance. The two-photon absorption coefficient of conventional inorganic perovskite ferroelectric materials is generally small, and the development of organic-inorganic hybrid perovskites is The design of new ferroelectrics with excellent two-photon absorption properties provides new ideas.
Luo Junhua, a researcher at the National Key Laboratory of Structural Chemistry in the State Key Laboratory of Structural Chemistry of the Chinese Academy of Sciences, organized a two-dimensional double-layered perovskite inorganic-organic hybrid ferroelectric through the introduction of mixed organic amine cations. The inorganic octahedron distortion and the disordered disorder of the organic cations in this compound induced the ferroelectric spontaneous polarization of the compound synergistically; at the same time, the compound exhibited a Curie temperature (322K) above the room temperature and a distinct ferroelectric spontaneous polarity. Chemicals. Research team of Chen Xueyuan, researcher of the Institute of Functional Nanostructure Design and Assembling Institute of Fujian Institute of Materials and Structures, and the research team of the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Wang Jun's research group found that the layered ferroelectric material showed good Two-photon absorption, with a two-photon absorption coefficient of up to 5.76 x 103 cm·GW-1. This study provides a new design strategy for designing perovskite ferroelectrics with excellent two-photon absorption properties, further expanding ferroelectricity. Body optical nonlinear absorption application research.
Relevant research results were published in the American Chemical Journal, and the first author was Li Yana, an associate researcher. The study was awarded the National Outstanding Youth Fund, the Strategic Pilot Project of the Chinese Academy of Sciences, the Haixi Research Institute of the Chinese Academy of Sciences’ 100-member team project and Chunmiao Talents' Special Project, National Natural Science Foundation of China's Excellent Youth Fund, etc.
